ML072780503
| ML072780503 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 09/30/2005 |
| From: | AmerGen Energy Co |
| To: | NRC/SECY |
| SECY RAS | |
| References | |
| 50-219-LR, AmerGen-Applicant-61, RAS 14275 | |
| Download: ML072780503 (6) | |
Text
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/ L/ t7j5 APPLICANT'S EXHIBIT 61 NUREG-1801, Vol. 2, Rev. 1 Generc Agng Lsson Generic Aging Lessons Learned. (GALL) Report Tabulation of Results US. NUCLEAR FEVOL COMMISSION In~M~rofA1At~~ v~EPIco-, UX.-
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- 92-lZ-Official Exhibit No.
62 k OFFERED by* 4ý jnsee Intervenor NR St4ff Other IOENTIFIED on I L 0*Nitness/Panel Acton Taken:
DM JECTED "OTHDRAWN Reporter/Clerk (9V Manuscript Completed: September 2005 Date Published:
September 2005 DOCKETED USNRC October 1, 2007 (10:45am)
OFFICE OF SECRETARY RULEMAKINGS AND ADJUDICATIONS STAFF Division of Regulatory Improvement Programs Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
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Al. CONCRETE CONTAINMENTS (REINFORCED AND PRESTRESSED)
Systems, Structures, and Components This section addresses the elements of pressurized water reactor (PWR) concrete containment structures. Concrete containment structures are divided into three elements: concrete, steel, and prestressing system.
System Interfaces Functional interfaces include the primary containment heating and ventilation.system (VII.F3),
containment isolation system (V.C). and containment spray system (V.A). Physical interfaces exist with any structure, system, or component that either penetrates the containment wall, such as the main steam system (VIII.B1) and feedwater system (VIII.Dl), or is supported by the containment structure, such as the polar crane (VII.B). The containment structure basemat typically provides support to the nuclear steam supply system (NSSS) components and containment internal structures.
September 2005 II1 A1-1 NUREG-1801, Rev. 1
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Structure Item Link and/or Material Environment Agingism Aging Management Program (AMP)
Further Component Mechanism Evaluation I1.A1-1 (C-08)
II.A1.1-h Concrete:
Concrete Air - indoor uncontrolled or air - outdoor Dome; wall; basemat; ring girder; buttresses Reduction of strength and modulus/ elevated temperature
(>150'F general;
>200'F local)
Plant-specific aging management program Yes, if temperature limits are exceeded The implementation of 10 CFR 50.55a and ASME Section XI, Subsection IWL would not be able to identify the reductic.,i of strength and modulus of elasticity due to elevated temperature.
Thus, for any portions of concrete containment that exceed specified temperature limits, further evaluations are warranted. Subsection CC-3400 of ASME Section III, Division 2, specifies the concrete temperature limits for normal operation or any other long-term period. The temperatures shall not exceed 150'F except for local areas, such as around penetrations, which are not allowed to exceed 200'F. If significant equipment loads are supported by concrete at temperatures exceeding 150'F, an evaluation of the ability to withstand the postulated design loads is to be made.
Higher temperatures than given above may be allowed in the concrete if tests and/or calculations are provided to evaluate the reduction in strength and this reduction is applied to the design allowables.
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Item Link Structure and/or Component
,ging Management Program (AMP)
Further Evaluation I
II.A1-2 (C-01)
II.Al. 1-a Concrete:
Dome; wall; basemat; ring girders; buttresses (spalling, scaling) and cracking/
freeze-thaw Chapter XI.S2, "ASME Section XI, Subsection IWL" Accessible areas:
Inspections performed in accordance with IWL will indicate the presence of loss of material (spalling, scaling) and surface cracking due to freeze-thaw.
Inaccessible Areas:
Evaluation is needed for plants that are located in moderate to severe weathering conditions. (weathering index
>100 day-inch/yr) (NUREG-1557).
Documented evidence confirms that where the existing concrete had air content of 3% to 6%, subsequent inspection did not exhibit degradation related to freeze-thaw. Such inspections should be considered a part of the evaluation.
The weathering index for the continental US is shown in ASTM C33-90, Fig. 1.
Yes, for inaccessible areas of plants located in moderate to severe weathering conditions a
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Structure Aging Effect/
Further Item Link and/or Material Environment Mechanism Aging Managemern Program (AMP)
Evaluation Component II.A1-3 II.A1.1-d Concrete:.
Concrete Any Cracking due to Chapter XI.S2, "ASME Section XI, Yes, if expansion/
Subsection IWL" concrete was (C-04)
Dome; wall; reaction with not basemat; ring aggregates Accessible /..,-eas:
constructed as girders; Inspections performed in accordance stated for buttresses with IWL will indicate the presence of inaccessible surface cracking due to reaction with areas aggregates.
Inaccessible Areas:
As described in NUREG-1557, investigations, tests, and petrographic examinations of aggregates performed in accordance with ASTM C295-54 or ASTM C227-50 can demonstrate that those aggregates do not react within reinforced concrete. For potentially reactive aggregates, aggregate reinforced concrete reaction is not significant if the concrete was constructed in accordance with ACI 201.2R.Therefore, if these conditions are satisfied, aging management is not
_necessary.
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Structure Aging Effect/
Further Item Link and/or Material Environment Mechanism Aging Management Program (AMP)
Evaluation Component II.A1-4 (C-03)
II.A1.1-c Concrete:
Concrete Dome; wall; basemat; ring girders; buttresses Ground water/soil or air indoor uncontrolled or air-outdoor Increase in porosity and p ermeability, cracking, loss of material (spalling, scaling)/
aggressive chemical attack Chapter XI.S2, "ASME Section XI, Subsection IWL".
Accessible Areas:
Inspections performed in accordance with IWL will indicate the presence of increase in porosity and permeability, surface cracking, or loss of material (spalling, scaling) due to aggressive chemical attack.
Inaccessible Areas:
For plants with non-aggressive ground water/soil; i.e., pH > 5.5, chlorides < 500 ppm, or sulfates <1500 ppm, as a minimum, consider (1) Examination of the exposed portions of the below grade concrete, when excavated for any reason, and (2) Periodic monitoring of below-grade water chemistry, including consideration of potential seasonal variations.
For plants with aggressive groundwater/soil, and/or where the concrete structural elements have experienced degradation, a plant specific AMP accounting for the extent of the degradation experienced should be implemented to manage the concrete aging during the period of extended operation.
Yes, plant-specific if environment is aggressive